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Adaptive pulse shaping. Femtosecond pulse shaping. Evolutionary algorithm. Applications of adaptive pulse shaping. high harmonic generation. Objective: Control HHG. (I.). atoms/molecules/ clusters/droplets. shaped. (II.). atoms. soft x-ray detector. fs-laser pulse. Three-step model. - PowerPoint PPT Presentation
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Adaptive pulse shaping
Femtosecond pulse shaping
Evolutionary algorithm
Applications of adaptive pulse shaping
high harmonic generation
shaped
(II.)
Objective: Control HHG
soft x-raydetector
atoms
fs-laser pulse
atoms/molecules/clusters/droplets
(I.)
Three-step model
P. Corkum, Phys. Rev. Lett. 71, 1994 (1993)
Harmonic generation geometry
A. Rundquist et al. Science 280, 1412 (1998)
XUV-detector
Atomic/molecular jet
fs-laser pulse
capillary
Experimental setup
Harmonic enhancement
0
5
10
15
20
25
30
Fit
ne
ss
efficiency: 106 photons/pulse in a single harmonic!
25 30 35 40 45
0
5
10
15
20
25
30
35
40
Inte
nsi
ty [
arb
.u.]
wavelength [nm]
~~
25 30 35 40 45-5
0
5
10
15
20
25
30
35
40
Inte
nsi
ty [
arb
.u.]
wavelength [nm]
fittest pulse shape
average fitness
unshaped pulse / reference signal
green2
red
fitness:2725
23
27
25
23
selective enhancement of HHG
A. Rundquist et al. Science 280, 1412 (1998)
vacuumpropagation
material dispersion
plasma dispersion
waveguide dispersion
simulation
Phase-matching
wav
elen
gth
[nm
]experiment
Selective Control of HHG
High-harmonic generation
A. Rundquist et al. Science 280, 1412 (1998)
XUV-detector
Atomic/molecular jet
shaped fs-laser pulse
capillary
25 30 35 40 45
0.0
0.2
0.3
0.5
0.6
0.8
1.0
before optimization optimized, same scale
spec
tral
inte
nsity
wavelength [nm]20 25 30
0.0
0.2
0.4
0.6
0.8
1.0
spec
tral
inte
nsity
wavelength [nm]
before optimization optimized10
generation geometry
Fitness: F = A / B
jet vs. capillary
control not only governed by the single atom response
A BB B BA
Summary
Selective Enhancement
25 30 35 40 45
0
1
2
3
4
5
6
7
Inte
nsi
ty [
arb
.u.]
wavelength [nm]
Comprehensive Control
Attosecond Quantum Control
Control beyond theatomic dipole phase
20 25 30
0.0
0.2
0.4
0.6
0.8
1.0
spec
tral
inte
nsity
wavelength [nm]
before optimization optimized10
25 30 35 40 45
0.0
0.2
0.3
0.5
0.6
0.8
1.0
before optimization optimized, same scale
spec
tral
inte
nsity
wavelength [nm]
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